A study was made of dispersive conductivity measurements in the O ion conductor Gd2(Ti2–yZry)O7. Increasing Zr content leads to higher concentration of O vacancies and resulted in higher activation energies for long-range ion transport, whilst the microscopic energy barrier for single ion hopping remained constant. Evidence was found that, besides the O binding energy, enhanced cooperation in O-ion dynamics determined the activation energy for long-range diffusion.

Cooperative Oxygen Ion Dynamics in Gd2Ti2–yZryO7. K.J.Moreno, G.Mendoza-Suárez, A.F.Fuentes, J.García-Barriocanal, C.León, J.Santamaria: Physical Review B, 2005, 71[13], 132301 (4pp)